Another paroxysm begins at or near the same hour next day (quotidian ague), which results from a double tertian infection, or the interval may be fortyeight hours (tertian ague), or seventy-two hours (quartan ague).
Another rule is that the quartan has the longest cold stage, while its paroxysm is shortest as a whole; the quotidian has the shortest cold stage and a long hot stage, while its paroxysm is longest as a whole.
It is the general rule, with frequent exceptions, that the quotidian paroxysm comes on in the morning, the tertian about noon, and the quartan in the afternoon.